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<html lang="en">
<head>
    <meta charset="UTF-8">
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    <title>Document</title>
    <style>

    </style>
</head>
<body>
    <button>按钮</button>
    <ul></ul>
    <script>
        let btn=document.querySelector("button")
        let ul=document.querySelector('ul')
        btn.onclick=function(){
            ul.innerHTML=`
            <li>香蕉</li>
            <li>苹果</li>
            <li>鸭梨</li>
            `
        }
    </script>
</body>
</html>